U.S. military, intelligence and law enforcement officials were briefed late last month on a threat against the Pentagon’s most senior leaders while they are on American soil, not just traveling overseas, according to five senior U.S. officials with direct knowledge of the matter.

Some officials said the briefings suggested the threat, which remains active, may be potential retaliation for the U.S. military’s assassination of Iranian Gen. Qassem Soleimani in January, although the information provided did not draw a definitive link.

The briefings have included information that suggests the targets of the threat are U.S. military leaders who were involved in the decision and operation to assassinate Soleimani, officials said. The briefings have also included information about a list, compiled by adversaries, of the names of military leaders who are to be targeted, according to two senior U.S. officials.